It is possible to see major gains in a couple months, it is all about how hard you are willing to work and how you train. I can guaranty you an inch in 12 weeks if you follow SRT Theory: Maximizing gains and Healing.
Let me put it to you this way, there is a guy who has a routine thread to prove it who has gained 2 inches in length and 1.5 inches in girth within 6 months.
An extreme example but you should be seeing gains within two months definitely.
Here's a tip. For the next few months, work your ass off doing Penis Enlargement. Be consistent and committed and you will be pleased with the results.